Because of the very low warpage of PET and PETG filament, this print is designed to warp very easily so the printer can be tested. In particular:
Printing video: https://vid.me/eEIW
Result video: https://vid.me/eEUW
- The base is very thin, so it can flex upwards at the ends easily.
- The design is long, giving lots of room for warp to occur.
- The pointy ends provide almost no attachment to the bed, yet easily show any warpage upwards.
- The bottom corners are square (the worst kind for warps).
- The tall rails give lots of leverage for the top layers to cool and contract, thus pulling up on the base. And of course:
- No brim or pads or anything else to help.
The real test for PET and PETG are on open (non-enclosed) printers with plain glass, because the no-smell and no-warp characteristics of this filament make printing much easier and cheaper using simple, open machines, and hopefully without any coatings applied to the glass.
The black print pictured was:
Printed on Createc steel i3 "Psique" prusa printer.
eSun opaque black 1.75 PETG filament in 1kg roll.
Sliced by Slic3r v1.2.9
245/100 temps (110 first layer).
0.3 layers (0.4 first layer).
250% extrusion width first layer.
2 shells, 2 floors, 2 ceilings.
20% rectiliner infill.
30 mm/s (60 for bridges).
80 mm/s travel.
No cooling fan.
No retraction (except for long moves over 50 mm which get 1 mm retraction).
Leveling done manually with piece of paper sliding easily at all points.
Plain glass (no hairspray, glue or anything else) cleaned with alcohol.
Gino pads to hold glass (no clips).
Printed in a 80F (27C) room, with AC drafts.
When the glass plate cools, the print almost pops off by itself.