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MakerGear M2: PETG Chain Mail

After the initial slicing parameter setup, I ran off several chain mail patches for fine tuning; they test platform adhesion, first layer thickness, bridging, and general quality.

The first layer started out a bit squashed:

Chain Mail - PETG on nozzle - platform switch clearance

Chain Mail – PETG on nozzle – platform switch clearance

The clearance under that switch lever doesn’t amount to much…

The patch came out looking pretty good, though:

Chain Mail - 4-wide - PETG hairs - bridging

Chain Mail – 4-wide – PETG hairs – bridging

The small red blob on the right side of the nozzle in the first picture tells a tale: the nozzle tends to pull fine hairs from one perimeter to the next, despite 1 mm of retraction. Fiddling with the retraction on subsequent patches didn’t improve matters.

Even though the infill isn’t overstuffed, the nozzle tends to collect and redeposit small amounts of PETG as it travels over the surface. Those small blobs turn into fine hairs when the nozzle moves from one island to the next.

Reducing the bars from six threads to four threads shows that bridging (at 25 mm/s and 0.9 flow rate) seems messier than PLA:

Chain mail - 4 strand PETG bridging

Chain mail – 4 strand PETG bridging

Despite that, all the links came out OK and the sheet was reasonably flexible. After some fiddling with speeds and patterns, these small-link patches popped off the platform easily and were just as flexy as the PLA sheet below them:

Chain Mail - PETG patches atop PLA patch

Chain Mail – PETG patches atop PLA patch

So far, so good.

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