Warp test for PET and PETG filament

thingiverse

Because of PET and PETG filament's exceptionally low warpage, this print is engineered to warp very easily so the printer can be thoroughly tested. Specifically: Printing video: https://vid.me/eEIW Result video: https://vid.me/eEUW 1. The base is extremely thin, making it easy for the ends to flex upwards. 2. The design is long, allowing ample room for warpage to occur. 3. The pointy ends provide minimal attachment to the bed yet easily showcase any warpage upwards. 4. The bottom corners are square (the worst type for warps). 5. The tall rails give plenty of leverage for top layers to cool and contract, thus pulling up on the base. And of course: 6. No brim or pads or anything else is used. The real test for PET and PETG filaments lies in open (non-enclosed) printers with plain glass, as their no-smell and no-warp characteristics make printing significantly easier and cheaper using simple, open machines, hopefully without any coatings applied to the glass. The black print pictured was printed on a Createc steel i3 "Psique" Prusa printer. Using Sun opaque black 1.75 PETG filament in a 1kg roll. With a nozzle size of 0.4 mm. Sliced by Slic3r v1.2.9. At temperatures of 245/100 (110 for the first layer). With layers at 0.3 mm (0.4 mm for the first layer). And an extrusion width of 250% on the first layer. Using two shells, two floors, and two ceilings. 20% rectilinear infill. Printing at a speed of 30 mm/s (60 for bridges). Traveling at 80 mm/s. Without a cooling fan. No retraction was used (except for long moves over 50 mm which got 1 mm retraction). Manual leveling was done with a piece of paper sliding easily at all points. The plain glass was cleaned with alcohol. Gino pads were used to hold the glass in place (no clips). Printed in an 80F (27C) room, with AC drafts. When the glass plate cools, the print almost pops off by itself.