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Hangprinter version 3

Posted by tobben 
Re: Hangprinter version 3
March 03, 2018 06:17PM
Nice, looking forward to it!

The Hangprinter plugin doesn't work, don't use it. The calibration procedure is outdated and will not work. It also gets motor directions the wrong way. I've never used it myself, but it has severely complicated debugging that I've participated in.

Re: Hangprinter version 3
March 10, 2018 09:23PM
I know this is off topic here but could locate no better place to contact you.

A group of which I am a member (located in New Jersey, USA), is embarking on a hangprinter project. We aren't smart enough to hew to the known parameters, so we are trying to engineer something new for ourselves.

We have a space large enough for 7-meter radii and greater vertical, if desired. Our plan is to mount motors, gears, power supplies, and transceivers at the radii and on the mover, connecting the whole thing with Bluetooth or WiFi.
Thus the mover will hold the extruder (probably dual), fans, power supply, transceiver, and the vertical drive and gearing. We hope this won't prove too heavy; we do plan to counterweight it.
We have no current plans for any of the electronic and drive exotica that you are engaged in but could be convinced to try.
We recognize that this is a significant departure from the norm that you have established but are daft enough to pursue it. Whether we have the technical capability will come out as we proceed.

If you choose, you could be a valuable resource for us. I'm guessing that we'll need all the help we can get.

-First, is the basic idea sane?
-I think the kinematics look simple. If I am wrong, point me to a lucid discussion of the issues. In any event, do I need to be concerned with anything other than the basic positioning of the mover, accurate location of the four fixed points, and being certain that all drivers actuate according to identical timing profiles?
-I worry about the tensioning of the lines in what is clearly an over-constrained system. I caught the item about not using stretchy line but am also concerned about line weight and so on. Are these really issues? If so, have you proposed solutions?
-I noted the issue of line build-up affecting spool diameter. My proposal is to use a drum with threading on the exterior to permit a flat wind. With sufficient diameter and length, I calculate that it will accept as much line as we need. Comments?
An alternate system uses pinch rollers and a separate take-up system [similar to the tape columns on early main-frame computers, if your memory goes back that far]. This seems overly complex but do-able. Comments?
-The geometrics of the available build volume seem a bit elusive. Making the mover larger or putting extended arms on it will make the neck at the top larger but seem to cause a reduction in the diameter near the bottom through the movement restriction. Is this correct?
-Finally, since this is clearly a branch from the main thread of HP3.3 design, where would you prefer that I contact you, if indeed elsewhere?
Re: Hangprinter version 3
March 11, 2018 02:43PM
Hello dougmoffitt,
Cool that you're designing a cable driven 3d printer!
If you look closely in the Hangprinter archives, you will find a lot of useful information. Links here: [hangprinter.org]

I think you'll like the Mechaduinos. They will let you auto calibrate anchor locations and never worry about lost steps.
I think you might regret counterweights. I used it back in 2014/2015. See my blog posts and forum posts from that time for details.

I think it's easier if we use the word "Hangprinter" only when we mean the 3d printer that is designed by the Hangprinter Project.
Other 3d-printers that are similar to Hangprinter will typically be
- frameless (anchors are mounted directly on existing structures),
- cable driven,
- over constrained,
- and parallel reprap 3d printers/machines/robots.
I don't have a trademark or anything, so you're free to use the words you like, but using the four descriptive phrases above will avoid confusion.

If you want my personal support on non-Hangprinter design problems, PM me your email, and I'll give you a price.

Edited 1 time(s). Last edit at 03/11/2018 02:44PM by tobben.

Re: Hangprinter version 3
March 16, 2018 04:33AM
Hi tobben

Really interested in making one of these myself.

I have seen in the videos that you can enter a value for how far above the build surface the 3 anchor points are. Is it possible using this setting to have the anchor points on the ceiling? My thinking for this is that once built I would like to leave the printer in place so having the anchors on the ceiling would mean that I could lift the print head up to the ceiling when not in use and all the lines would also then be up and out of the way and may also allow for a larger print area as the lines wont hit the print.

Ime quite a way off putting it together as need to build the workshop that the printer will live in first but am hopefully going to get started on printing the parts I need soon.

Re: Hangprinter version 3
March 16, 2018 05:43AM
Hi Karl

The answer to your question is yes, you can use the firmware as you suggest, even though Hangprinter actually has four anchor points.
Some prior art for you:

The geomery you propose has been discussed in the v2 thread.

The Hangprinter is designed to be parked in the ceiling already. Footprint on the floor is a few screw heads. See

Best regards

Re: Hangprinter version 3
March 16, 2018 07:51AM
Great thanks ill have a look through, will update on progress here.
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