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My printer drilled through my hotbed. Can you help? (lemm.ee)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/3dprinting

19 comments fedilink hide all child comments

I got my Kywoo Slim printer last week, and it's done well for its price of £200, although it was slightly bad at detail as it would drag the filament along with it, rather than the filament adhering properly to the build plate.

Today I tried to fix that issue by increasing the nozzle temperature from 200° to 210°, which is in the recommended range for PLA filament (190 to 220). My hotbed temperature has stayed constant at 60°. Quite to my surprise, instead of printing normally or even at all, my nozzle instead dove down straight into my build plate, through the hotbed underneath it, and started melting the plastic and vibrating, drilling through the hotbed.

I stopped it printing immediately and inspected the damage. There was a hemispherical dip in my build plate, with a hole all the way through it in the center. In the hotbed directly underneath it, there was an indentation probably about 1mm deep in the exact size and shape of the nozzle.

Can you help me understand why changing the nozzle temperature would have caused it to do this, or if my printer is safe to use now? Also, can I fix it, and if so how?

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[–] Hazdaz 2 points 1 year ago (1 children)

Maybe.

Printers work in different ways. The convential way is literally a simple switch that's screwed into the Z axis (most of the time aluminum extrusion) and when the carriage lowers enough it hits it and triggers it.

What you are describing sounds like it might be part of the auto bed leveling function of your printer.

I wonder if your printer is combining the limit switch function with the bed leveling function with one sensor. That would save money in manufacturing. I don't have a printer with auto bed leveling so I can't tell you if that is common to merge both functions with one sensor. Maybe someone here has experience with that and can answer your question. Maybe search the printer's website for information that explains that part.

I guess one way to test it is to see if you can trigger that sensor and see if the printer then thinks it is at a height of 0. I wish I could help more,but I'm not familiar with that specific model of printer.

[–] [email protected] 2 points 1 year ago

Ok, thanks for the help you can give, I'll do some research.