SoliForum - 3D Printing Community — Printing really long objects with a small build platform

Re: Printing really long objects with a small build platform

null@example.com (shutterbug2020) — Wed, 14 May 2014 05:17:55 +0000

Would brushing the external surface with acetone or tetra assist with a delamination issue?

Re: Printing really long objects with a small build platform

null@example.com (Briggs) — Tue, 28 Jan 2014 23:31:20 +0000

I will give it a go and post back results.

Re: Printing really long objects with a small build platform

null@example.com (adrian) — Tue, 28 Jan 2014 06:47:05 +0000

yeah, sounds like it has fun stuff in there, including a decent amount of tetrahydrofuran.... worth trying for results at that price

Re: Printing really long objects with a small build platform

null@example.com (ronsii) — Tue, 28 Jan 2014 05:34:24 +0000

^^ looks like a great cocktail

Re: Printing really long objects with a small build platform

null@example.com (Briggs) — Tue, 28 Jan 2014 04:06:30 +0000

Adrian and MolecularConcept, what do you think of this ingredient list? It's from a MSDS of Oatey brand "All Purpose Cement". Easy to get at the Home Depot, etc, costs $6/8oz.

I'm looking for a glue that is readily available, cheap, and super strong.

CAS # Component Percent
109-99-9 Tetrahydrofuran 30-45
108-94-1 Cyclohexanone 10-20
67-64-1 Acetone 10-20
78-93-3 Methyl ethyl ketone 8-18
9002-86-2 PVC (Chloroethylene, polymer) 8-15
68648-82-8 Ethene, chloro-, homopolymer, chlorinated 3-7
112945-52-5 Silica, amorphous, fumed, crystalline-free 1-5

Re: Printing really long objects with a small build platform

null@example.com (adrian) — Tue, 28 Jan 2014 02:00:12 +0000

Yeah, it'll work. I offered the proper industrial grade solution as there seemed to be a fair level of concern regarding the strength of the joint.

a Tetra joint will beat a MEK/Acetone joint for mechanical strength... so the question then is more 'do I need more than MEK/Acetone will offer me, which is pretty good to begin with'

To that end - I guess the OP is the only one who can answer. Acetone could work more than adequately, but if there is a concern about it, then the next step up is tetra.

So yes - the context of my recommendation was concern about the mechanical strength - not about general methods of joining two bits of plastic

Re: Printing really long objects with a small build platform

null@example.com (MolecularConcept) — Tue, 28 Jan 2014 01:56:24 +0000

you can use any of them. they will all bond the plastic on a chemical level. i would simply dip the male end in acetone and stick it in the female end, little pressure for a few mins and you should be good to go. i dont think you need anything more complicated than that. just my 2 cents

Re: Printing really long objects with a small build platform

null@example.com (tycoonman1) — Tue, 28 Jan 2014 00:35:03 +0000

Would the regular acetone/PVC mixture ABS "cement" not do the trick?

Re: Printing really long objects with a small build platform

null@example.com (MolecularConcept) — Tue, 28 Jan 2014 00:22:18 +0000

hmm tetrahydrofuran is some nasty stuff! super solvent though, be careful with it.

Re: Printing really long objects with a small build platform

null@example.com (adrian) — Mon, 27 Jan 2014 23:21:20 +0000

MolecularConcept wrote:

MEK from the hardware store is a great solvent for ABS better than acetone. you cold also mix the two 50/50 for faster evaporation.

Check the product I recommended. .. Tetra... its a proper plastic solvent...

Re: Printing really long objects with a small build platform

null@example.com (MolecularConcept) — Mon, 27 Jan 2014 23:10:19 +0000

MEK from the hardware store is a great solvent for ABS better than acetone. you cold also mix the two 50/50 for faster evaporation.

Re: Printing really long objects with a small build platform

null@example.com (tycoonman1) — Mon, 27 Jan 2014 04:30:20 +0000

Where's the "like" button?

Sounds like HPB will be next on the list.

Re: Printing really long objects with a small build platform

null@example.com (adrian) — Mon, 27 Jan 2014 03:41:38 +0000

using a proper solvent, its not a standalone piece of plastic anymore - it is actually chemically bonded to the neighboring ABS in a manner stronger than the FDM.. Considering your above pic, there would be 1cm * 3 surfaces = 3cm+ of solid chemical bond that is now chemically actually 'one piece' not two 'glued together' (like if you just used tarzans grip or something...)...

again - the *joint* will be stronger than the surrounding plastic. You will have more problems with it delaminating below the joint than the joint failing itself... its purely chemistry and physics in action

Re: Printing really long objects with a small build platform

null@example.com (tycoonman1) — Mon, 27 Jan 2014 03:38:25 +0000

No HPB at the moment. I'll try this concept out (obviously w/o solvent) when I get my printer back from Solidoodle. My concern is that the "male" part of each piece would be pretty weak given the OD of each section would only be roughly 1cm.

Re: Printing really long objects with a small build platform

null@example.com (adrian) — Mon, 27 Jan 2014 02:24:47 +0000

If you use a proper ABS solvent - such as "Tetra" - to bond the pieces, the joints will be stronger than the surrounding non-bonded plastic and the join lines will be invisible.