Mendel heated bed

Release status: Experimental

Description	Mendel Dibond heated bed
License	GPL
Author	User:Adrian
Contributors
Based-on	Mendel
Categories	Category:Mendel
CAD Models	Heated-bed-design-files.zip
External Link

Introduction

If you build fused-filament-fabrication parts (the technology that RepRap uses) at room temperature, they have a tendency to curl as they cool from the bottom up. This is caused by higher layers shrinking as they cool, and bending the already-set lower layers upwards.

Different plastics suffer from this problem to different extents. ABS is quite bad. Polylactic acid (PLA) is quite good. Indeed, if you make a single PLA part in your RepRap, curling probably won't be a problem at all - the part will stay warm enough from one layer to the next to eliminate the problem almost completely.

But if you build whole trays of parts (as in the picture) then, even using PLA, you can get some curling. The cure for this is to build on a bed that is heated.

This heated bed is primarily for making polylactic acid (PLA) parts. It probably won't run hot enough for ABS. But that guess is subject to correction by experiment.

The CAD and other design files for this heated bed can be downloaded from here.

Cutting out

The main part of the heated bed is made from Dibond. This is a sandwich of LDPE between two sheets of aluminium. It is very light, very stiff and very flat - all required properties for a RepRap build bed. The bed is made from a sheet of Dibond with heating wires and insulation attached underneath.

The plastic in the sandwich is not the world's best thermal conductor, but the bed is thin enough that it seems to work well.

I bought my Dibond from these people who kindly cut it into rectangles of , but it is pretty widely available as it is used for making signs and exhibition stands and such like. It's also pretty cheap.

This shows the pattern to be cut from 3 mm thick Dibond (the .dxf file for this is in the CAD download). The shape is exactly the same as the standard Mendel build bed, but with the addition of the tab at the back for mounting electrical connections.

You could try cutting the Dibond in a laser cutter, but the aluminium may well give trouble if you do. I found that a bandsaw worked best. If you saw out the shape, gently clean the edges with a file afterwards to remove any lips and burrs.