1 Topic by TickTock (edited by TickTock 2015-03-23 00:58:03)

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Topic: Print a spare carriage NOW!

Been said before, but I thought I'd reiterate.  I've been planning to print the Lawsy carriage "as soon as I finish this one more project" for about a dozen projects now and now my stock SD4 carriage finally broke :'(
http://www.soliforum.com/misc.php?action=pun_attachment&item=8368

Don't make the same mistake.  Stop now and print it!

I glued it back together with acetone.  Also glued a splint (made from scrap ABS) across the top to help reinforce it.  Hopefully it lasts long enough to get my new carriage printed.  If not, I'll come begging, hat in hand...  ;-)
http://www.soliforum.com/misc.php?action=pun_attachment&item=8370

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2 Reply by wardjr

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Re: Print a spare carriage NOW!

If I only had a nickel for every time I've said "print a spare" smile

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3 Reply by jagowilson

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Re: Print a spare carriage NOW!

Mine broke in nearly the same place. Junk. You'll like linear bearings.

4 Reply by TickTock

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Re: Print a spare carriage NOW!

jagowilson wrote:

Mine broke in nearly the same place. Junk. You'll like linear bearings.

Yeah, amazing it lasted this long really.  Not even a stress riser in the design - shop101!  Of course the light infill didn't help matters either.

5 Reply by jagowilson

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Re: Print a spare carriage NOW!

Well they design them to print quickly and die quickly so that seems fitting wink

6 Reply by patrick.w.york

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Re: Print a spare carriage NOW!

I need to do this. I think after seeing this post I know what I am printing tonight. Hopefully it works on the SD Workbench Apprentice.

7 Reply by TickTock

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Re: Print a spare carriage NOW!

Mischief managed.  Got all my parts printed once in ABS and again in Nylon and the repair is holding.  I'll be assembling this weekend.  I think the splint was key.  Patrick and others who wish to delay the repair as long as possible may want to go ahead and add a splint now across the top as I did.  Might not fail at all with that extra measure (but still print the spare :-)).

8 Reply by TickTock (edited by TickTock 2015-03-31 14:08:28)

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Re: Print a spare carriage NOW!

Got the Lawsy carriage installed yesterday using a modified top to support the stock extruder.  It's nice!  Much less drag than the bushings.  I had to replace all the smooth rods - the originals felt very gritty (I guess slightly oversized and loading the bearings too much).  The belt guard in the back left was printed with the new carriage and if you look closely, you can see some ringing on the Y axis (manifests as ripples in the X to the left of each of the slots).  The extra drag in the original bushings was probably damping that (at the cost of hysteresis).  I'll back off on the acceleration to see if I can eliminate it.  Does the Marlin acceleration setting also affect the decelleration?

http://www.soliforum.com/misc.php?action=pun_attachment&item=8423

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