Lack enclosure - heatbed cable?

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Mak

(@mak)

Eminent Member

Lack enclosure - heatbed cable?

My Mk3 arrives next week (!!) so I've been reading and prepping as you do. ABS is my preferred filament so it's going straight in an enclosure, and I'm following the standard Lack build.

One thing I haven't got a firm answer on from the internet is the heatbed cables. I see that the newer Mk3s come with screw terminals, but on Thingiverse there is conflicting information as to whether any of the current Things work well with the new style terminals.

Please can somebody on here confirm categorically what design works/point me at a design that is proven for this.

My backup approach is to take the control unit out of the enclosure (it's a kit so I can do all this at build) and just move the printer forwards a few cm.

Cheers.

Posted : 13/12/2018 10:57 pm

ron

(@ron)

Estimable Member

Re: Lack enclosure - heatbed cable?

i just confirm that doing a 45° angle at the terminal to avoid the cable touching the back of the enclosure is not a good idea. then the hotend and the bed cables touch themselves when the nozzle is at the left back and just over the bed.
i have to find another solution.

Posted : 14/12/2018 1:40 am

JBinFL

(@jbinfl)

Reputable Member

Re: Lack enclosure - heatbed cable?

Here:

https://www.thingiverse.com/thing:2964580 screw or bolt version

https://www.thingiverse.com/thing:2890592/comments Soldered version

Thie first one is for the screws or bolts and the second is for the soldered cables. I have the bolt version of the heatbed and can confirm the 60 degree cover works, check my posts for pics of my enclosure where I am using it. I am pretty sure I am using the bolt/screw version... but it works well.

The 45 degree version can cause errors slamming into the back plexiglass.

Strange women, laying in ponds, distributing swords, is hardly a basis for a system of governance!

Posted : 14/12/2018 2:03 am

Butterworth De...

(@butterworth-design)

Trusted Member

Re: Lack enclosure - heatbed cable?

I have the heatbed with screw terminals, and I found that the 60 degree clamp linked above was too tight (you can see in the pictures on the Thing itself), and the insulation of the ring terminal interferes with the exit hole. The clamps designed for the original soldered terminals do not work with the ring terminals. I tried, and there wasn't sufficient clearance for the heads of the screws on the bed, and the soldered-terminal version of bracket cracked at the screw as I installed it.

I decided to redesign the whole thing from the ground up, accounting for screw clearances and adding several mm of depth to the entire thing.

It turned out very well, and has been rock solid since I printed and installed it back in August. 60 degrees is definitely a good angle, and the cable itself never becomes kinked or bent severely. I think the bend radius ends up being better than the stock straight-out version of the clamp.

See here for the file: https://www.thingiverse.com/thing:3283240