Mini Mushroom Overhang & Short Layer Torture Test

thingiverse

This set of tiny models measures just 20 mm in diameter and 10 mm tall, making them challenging to print depending on material and settings used. The advantage lies in the fact that this test can be completed in as little as 7 minutes or less, requiring minimal material (the prints in the photo take approximately 1 gram), thus making it ideal for validating changes to cooling setups without waiting for a large test object to print. A cooling fan directed towards the printed object serves two main purposes: one is to improve the quality of printed overhangs by immediately solidifying material before it can droop down, and the second is to cool down 'short layers,' which are layers so small that the material has too little time to cool on its own before a new layer is printed on top. This test model acts as a compromise between both purposes, although you can remove the 'short layer' aspect by scaling up the model and/or printing slower. WARNING: Depending on how they are printed, these test models may warp excessively to the point where they will cause considerable forces on your print bed and nozzles. Monitor each print closely and be ready to abort if things go awry, or the 'torture' part may become all too real. Print Settings Printer: FlashForge Creator Pro Rafts: No Supports: No Resolution: 0.2 mm Infill: 15% Notes: I tested in Slic3r with two layers and concentric 15% infill. Each model contains a hollow tube that prevents Slic3r from attempting to deposit infill in thin air for these specific settings. I should file a bug report for this sometime. To check whether a particular cooling setup performs better than another one, find a set of settings where the old setup provides an almost-but-not-quite OK result on one of the test objects of choice (the lower angles are easier if you cannot make them fail, try a larger angle). Then print the exact same file with the modified setup and check whether it produces a better outcome. Post-Printing For validating prints, check whether the top surface is perfectly flat and check the sides for blobbing.