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What would cause increasing Z height after hours of printing?

janpenguin

What would cause increasing Z height after hours of printing?
April 02, 2016 12:38AM

Registered: 9 years ago
Posts: 189

One or two days after hours of printing, the Z height increases 0.2 to 0.3 mm.
To have good first layer, I manually increase Z height before printing a model.
Yesterday the Z height was 172.37, today at Z 0, the nozzle failed to grab a test paper.
The nozzle was -0.3 mm off on the print bed.

Thanks in advance.

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dc42

Re: What would cause increasing Z height after hours of printing?
April 02, 2016 12:51AM

Registered: 10 years ago
Posts: 14,672

Thermal expansion perhaps?

When starting a new print after finishing another, I always either reset the Z=0 height using the Z probe, or run auto calibration.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].