Makergear M2: Heating Times

With the platform and extruder starting at the 19.5 °C = 67 °F Basement Laboratory ambient …

The extruder takes 1 minute to reach 175 °C, overshoots to about 180 °C, crosses 175 °C going downward at 1:30, then gets up to 174 °C again at 3:15. I ran a PID tuning session quite a while ago with inconclusive results. Reducing the initial overshoot would probably increase the time-to-get-ready, with no net improvement.

The platform, which isn’t the stock Makergear hardware, requires 3:30 to reach 69 °C, just under the 70 °C target, at which point it’s ready to start. There’s no insulation under the PCB-trace heater, but some previous tinkering implies that running bare doesn’t make much difference, particularly with a fan blowing on the top surface of the glass.

M2 - Improved HBP - bottom view
M2 – Improved HBP – bottom view

The modified platform runs from a 40 V supply with an initial power of 250-ish W at ambient. A quick measurement at 75 °C during a print:

  • 40 V @ 5.8 A = 230 W peak
  • 10 s on / 30 s off = 25% duty cycle
  • 230 W × 0.25 = 58 W average

Remember that’s with an outboard SSR to unload the RAMBo’s MOSFET.

By and large, the M2 is ready to print in under 5 minutes from a standing start, which is just about enough time to spritz hair spray on the platform, load the G-Code into Pronterface, and so forth and so on.

4 thoughts on “Makergear M2: Heating Times

  1. 3:15? That doesn’t sound right. It takes nearly twice as long to get back to 175 from the undershoot as it does from a standing start?

    1. That’s the total elapsed time: the undershoot recovery takes about the same amount of time as the initial ramp. Cranking the integral term up a bit should help, but it really doesn’t make much difference, because the platform remains within a degree or two of the setpoint thereafter.

  2. Mostly off topic, but I thought I would share: I mentioned before I had backed the Deltamaker on kickstarter. It finally shipped, nearly a year late. Of course they would ship it just after I left on a 3 week vacation overseas. Predictable, really…

    I just got back and have not unboxed it yet.

    1. It seems that most Kickstarter projects involve not only building an innovative product, but building an entire company that must deliver far too many Rev 0.1 products during the first week. With any luck, that box will contain all the right parts for a great printer.

      Let us know how it works!

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