16.1.1 Objects warping or coming loose or getting knocked loose of build plate

1.

If an object appears warped due to coming partially or fully loose from the build plate during the print, take steps to improve adhesion; see Section 15.4 for some ideas.

Printer features such as a heated bed and and an enclosed print chamber (or even better, a heated print chamber) can be very helpful when printing a type of filament (e.g., ABS) especially prone to shrinking as it cools; you may also wish to disable any printer “Cooling Fan”.

2.

If an object’s bottom edges are curling up, perhaps coming loose, from the build plate, extra attention to adhesion (see Section 15.4) may help. With PLA filament, another contributor to edge curl could be that you are printing at too high of a temperature; see Section 15.4.4. If you are using ABS filament, however, edge curl is quite a common issue: besides the suggestions already mentioned, see also the tips for ABS printing in Section 15.5.1.

Printing with a brim or raft may also help keep the object adhering to the build plate; under “PRINT SETTINGS”, “BASIC”, see “Platform Adhesion Type”.

3.

If intended voids or gaps in an object have curled up bits where extrusion was supposed to stop, or smeared edges where extrusion was supposed to stop or start, then besides looking bad (see item 19), curled up bits can even result in the extruder “catching” on a lip of previously extruded material and actually knocking the print loose of the build plate when the extruder comes to a section and resumes extruding! In such cases, in addition to checking your filament retraction settings (see item 18) you may also need to set a Z hop to raise the extruder nozzle (actually the entire print head) during non-extrusion moves. For adjusting the Z hop if printing through the Polar Cloud, under “PRINT SETTINGS”, “ADVANCED”, “Retraction”, adjust the “Z hop”.