Posts Tagged M2
The top looks slightly understuffed, but it’s solid:
They’re a nearly perfect fondletoy, so I can understand why they rolled away…
They’re a bit easier to see in the digital realm:
The trick is that they’re both eight layers thick at 0.20 mm/layer. With the platform aligned exactly right, all the objects should measure exactly 1.60 mm thick.
The blue numbers give the thickness measured across the stem, just above the hole, on each object:
The green numbers are the skirt thickness: 22 = 0.22 mm.
The platform has a tilt of 0.20 mm from +Y to -Y and is just about perfect from -X to +X.
The M3x0.5 adjusting screws under the (improved) platform, seen from the front (-Y) end of the platform:
The silicone plugs inside the springs are slightly compressed, so the springs are only decorative. The platform is rigidly mounted on the plugs, with only very slight compliance, and I haven’t leveled the platform in a few months.
Tightening the “north” adjusting screw by 1/6 turn lowered the +Y end of the plate by about 0.05 mm and tilted the +X side slightly higher:
The skirt thicknesses are now in blue, too.
Tightening the “north” screw an additional 1/6 turn and tightening the “east” screw 1/6 turn produced an almost perfect result:
The thicknesses don’t vary quite randomly, but I think further adjustments won’t make much difference: the total range is only 0.12 mm = 1.53 to 1.65 mm. That’s pretty close to the limit of my measurement ability on the plastic pieces.
Notice that the skirt thread, which should be exactly 0.2 mm thick all around, really isn’t. I’m going to see whether a two-layer-thick skirt measures a more consistent 0.40 mm.
More than five hours of stand-up comedy condensed into two minutes of frenzied video showing activity like this:
The Sony HDR-AS30V perched atop a tripod behind the table, where only one errant Scout bumped it, recording one image every 5 seconds. The non-adjustable focus seems biased for selfies, but the compression definitely produces softer images in subdued lighting conditions, so it’s hard to say.
Each NP-BX1 battery lasts about 2.5 hr in that mode and I brought all three, but simply forgot to install the third one. As a result, we don’t get to see the last 2+ hours… it was a long day.
The “image processing” behind the movie went a little something like this, modulo a few edits to elide my blundering around:
sudo mount /dev/sdb1 /mnt/backup sudo mount -o uid=ed /dev/sdd1 /mnt/part mkdir /mnt/backup/Video/2014-05-17 rsync -au /mnt/part/DCIM/100MSDCF/ /mnt/backup/Video/2014-05-17 rsync -au /mnt/part/DCIM/101MSDCF/ /mnt/backup/Video/2014-05-17 cd /tmp mkdir Video cd Video sn=1 ; for f in /mnt/backup/Video/2014-05-17/*JPG ; do printf -v dn 'dsc%05d.jpg' "$(( sn++ ))" ; cp -a $f $dn ; done mkdir Shrink for f in *jpg ; do convert $f -resize 50% Shrink/$f ; done cd Shrink/ avconv -r 30 -i dsc%05d.jpg -q 5 3DPrinting-q5.mp4 mv 3DPrinting-q5.mp4 "3D Printing Demo - HV Scout CamporALL 2104.mp4"
One could, of course, do all that in fewer steps, if one knew the answers ahead of time, which
should may apply when I refer back to this post.
rsync -au to copy the files from the camera to the 2 TB backup drive neatly solves the problems that occur when the camera’s USB port abruptly disconnects itself during the copy:
rsync can recover without losing or trashing any files. Alas, after the camera disconnects, it requires a power cycle to recover its wits.
The USB camera connection reads data at 6 MB/s. Removing the MicroSD card and jamming it in the card-reader slot on my monitor runs at 18 MB/s. Apart from the fact that the MicroSD card seems so flimsy, I wonder how long the spring-detent latch inside the camera will continue working. On the other paw, when the USB port finally breaks, it’ll take the GPS assist data path along with it.
Not shown: the
rename 'y/A-Z/a-z/' *JPG that converts the original filenames to lowercase, which I did after the fact. Because blundering around, OK?
The 3964 original 1920×1080 images, hot from the camera, weigh in at 2.2 GB and the half-size video emerged at 118 MB. The default
avconv quality setting produces surprisingly crappy results, so I used
-q 5. Some after-the-fact fiddling showed that
-qscale 5 produces the same file size with about the same apparent quality.
None of that matters, because Youtube set the maximum resolution to 480 and applied ruthless compression. Now I know better…
The whole reason I got a 3D printer in the first place was to make things that would otherwise be too difficult or tedious by hand or on a CNC mill. Most of the things I make look like brackets and I don’t do sculptures … this stuff solves problems!
Being able to go from “I need a part shaped like that” to holding the thing in my hand a few hours (or, for complex designs, days) later is empowering. Being able to adjust a dimension by changing the source code and “recompiling” to get a new part is wonderful.
These five slides from the presentation show my answers to the question “Why would anyone want a 3D printer?” Clicky for more dots.
You can find those and more by searching for
OpenSCAD source code.
They go along with the sheets of solid models.
Herewith, the MHVLUG – 3D Printing Status 2104 slides (remember slides?) I’ll be using for my talk this evening at the MHVLUG meeting; you don’t get the audio track in the PDF, but the pictures may be informative.
If you believe everything you read, you might think personal 3D printing will go like this:
But it requires entirely too much of this:
Personal 3D printing requires that you take full control:
Not knowing the answers, I’ll still make some guesses about what lies ahead:
And I found the best tchotchkes ever:
See you there…
(The PDF has clickable links for those images, plus the 60-some-odd other slides. The plan: talk like an auctioneer for an hour!)
Seeing as how the Tux chocolates were produced in a facility containing a big nut, some folks may prefer an (inedible, at least by humans, but correspondingly more permanent) Tux tchotchke in PLA. I plan to have the M2 running off more of them, so there should be enough to go around.
For what it’s worth, you can actually buy a 3D chocolate printer that seems rather overpriced for what’s basically a desktop CNC gantry mill with a heated syringe. The site seems dead, so maybe other folks came to that conclusion, too.
Some pix that serve as a stick in the ground showing that my current Slic3r configuration constellation doesn’t produce thin infill…
All of the layers in the 20 mm calibration cube look just like this:
The bottom layer of the Tux mold comes out solid:
As does the top:
The Gcode Analyzer algorithm that assigns colors to numeric values tends to produce many aliases, although most of the time you can figure out what’s going on. If somebody wants to dive into the code, I’d like to have unique colors and get the color table sorted in ascending order.
The current Slic3r configuration:
# generated by Slic3r 1.1.1 on Sat May 3 10:31:36 2014 avoid_crossing_perimeters = 0 bed_size = 190,250 bed_temperature = 70 bottom_solid_layers = 3 bridge_acceleration = 0 bridge_fan_speed = 100 bridge_flow_ratio = 1 bridge_speed = 150 brim_width = 0 complete_objects = 0 cooling = 1 default_acceleration = 0 disable_fan_first_layers = 1 duplicate_distance = 6 end_gcode = ;-- Slic3r End G-Code for M2 starts --\n; Ed Nisley KE4NZU - 15 November 2013\nM104 S0 ; drop extruder temperature\nM140 S0 ; drop bed temperature\nM106 S0 ; bed fan off\nG1 Z180 F2000 ; lower bed\nG1 X130 Y125 F30000 ; nozzle to right, bed front\nM84 ; disable motors\n;-- Slic3r End G-Code ends -- external_perimeter_speed = 25 external_perimeters_first = 0 extra_perimeters = 1 extruder_clearance_height = 25 extruder_clearance_radius = 15 extruder_offset = 0x0 extrusion_axis = E extrusion_multiplier = 1.07 extrusion_width = 0.4 fan_always_on = 0 fan_below_layer_time = 30 filament_diameter = 1.79 fill_angle = 45 fill_density = 100% fill_pattern = rectilinear first_layer_acceleration = 0 first_layer_bed_temperature = 70 first_layer_extrusion_width = 0.4 first_layer_height = 100% first_layer_speed = 25 first_layer_temperature = 175 g0 = 0 gap_fill_speed = 50 gcode_arcs = 0 gcode_comments = 0 gcode_flavor = reprap infill_acceleration = 0 infill_every_layers = 3 infill_extruder = 1 infill_extrusion_width = 0 infill_first = 1 infill_only_where_needed = 0 infill_speed = 150 interface_shells = 0 layer_gcode = layer_height = 0.2 max_fan_speed = 100 min_fan_speed = 75 min_print_speed = 4 min_skirt_length = 15 notes = nozzle_diameter = 0.35 only_retract_when_crossing_perimeters = 1 ooze_prevention = 0 output_filename_format = [input_filename_base].gcode overhangs = 1 perimeter_acceleration = 0 perimeter_extruder = 1 perimeter_extrusion_width = 0.4 perimeter_speed = 150 perimeters = 2 post_process = print_center = 0,0 raft_layers = 0 randomize_start = 1 resolution = 0.05 retract_before_travel = 1 retract_layer_change = 0 retract_length = 1 retract_length_toolchange = 5 retract_lift = 0 retract_restart_extra = 0 retract_restart_extra_toolchange = 0 retract_speed = 60 skirt_distance = 3 skirt_height = 1 skirts = 3 slowdown_below_layer_time = 20 small_perimeter_speed = 25 solid_fill_pattern = rectilinear solid_infill_below_area = 5 solid_infill_every_layers = 0 solid_infill_extrusion_width = 0 solid_infill_speed = 150 spiral_vase = 0 standby_temperature_delta = -5 start_gcode = ;-- Slic3r Start G-Code for M2 starts --\n; Ed Nisley KE4NZU - 15 Nov 2013\n; 28 Feb 2014 - 6 Mar 2014 - tweak Z offset\n; Z-min switch at platform, must move nozzle to X=130 to clear\nM140 S[first_layer_bed_temperature] ; start bed heating\nG90 ; absolute coordinates\nG21 ; millimeters\nM83 ; relative extrusion distance\nG92 Z0 ; set Z to zero, wherever it might be now\nG1 Z10 F1000 ; move platform downward to clear nozzle; may crash at bottom\nG28 Y0 ; home Y to be sure of clearing probe point\nG92 Y-127 ; set origin so 0 = center of plate\nG28 X0 ; home X\nG92 X-95 ; set origin so 0 = center of plate\nG1 X130 Y0 F30000 ; move off platform to right side, center Y\nG28 Z0 ; home Z with switch near center of platform\nG92 Z-4.40 ; set origin to measured z offset\nG0 Z2.0 ; get air under switch\nG0 Y-127 F10000 ; set up for priming, zig around corner\nG0 X0 ; center X\nM109 S[first_layer_temperature] ; set extruder temperature and wait\nM190 S[first_layer_bed_temperature] ; wait for bed to finish heating\nG1 Z0.0 F500 ; put extruder near plate \nG1 E25 F300 ; prime to get pressure, generate blob\nG1 Z5 F2000 ; rise above blob\nG1 X15 Y-125 F20000 ; jerk away from blob, move over surface\nG1 Z0.0 F1000 ; dab nozzle to attach outer snot to platform\nG4 P1 ; pause to attach\nG1 X35 F500 ; slowly smear snot to clear nozzle\nG1 Z1.0 F2000 ; clear bed for travel\n;-- Slic3r Start G-Code ends -- start_perimeters_at_concave_points = 1 start_perimeters_at_non_overhang = 1 support_material = 0 support_material_angle = 0 support_material_enforce_layers = 0 support_material_extruder = 1 support_material_extrusion_width = 0 support_material_interface_extruder = 1 support_material_interface_layers = 0 support_material_interface_spacing = 0 support_material_pattern = honeycomb support_material_spacing = 2.5 support_material_speed = 150 support_material_threshold = 0 temperature = 175 thin_walls = 1 threads = 2 toolchange_gcode = top_infill_extrusion_width = 0.4 top_solid_infill_speed = 25 top_solid_layers = 3 travel_speed = 250 use_firmware_retraction = 0 use_relative_e_distances = 0 vibration_limit = 0 wipe = 0 z_offset = 0