Double Helix / Week of July 31 to Aug 6 - 2012 I haven't heard from Greg, so I'm going to go ahead and post another competition here to get things going again. I made this a while ago, and it is both cool to have lying around and a challenge for bridging! Good luck! [www.thingiverse.com] DSC02764_preview_card.jpg mod_embed_images_loadimage('573d2c9fc6acc23a6aae4a7484871da8', 'https://reprap.org/forum/addon.php?282,module=embed_images,url=http%3A%2F%2Fthingiverse-production.s3.amazonaws.com%2Frenders%2F86%2Fba%2Fa9%2Fab%2Ff8%2FDSC02764_preview_card.jpg', 'http://thingiverse-production.s3.amazonaws.com/renders/86/ba/a9/ab/f8/DSC02764_preview_card.jpg', 'https://reprap.org/forum/addon.php?282,module=embed_images,check_scaling=1,url=http%3A%2F%2Fthingiverse-production.s3.amazonaws.com%2Frenders%2F86%2Fba%2Fa9%2Fab%2Ff8%2FDSC02764_preview_card.jpg', '', 145377, 800, 400, 'Loading image ...', false); https://reprap.org/forum/read.php?282,145377,145377#msg-145377 Sun, 08 Mar 2026 10:32:25 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?282,145377,148326#msg-148326 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,148326#msg-148326
I already had a print in mind DeuxVis. However, if you win the competition you can create it yourself. I thought it only fitting that since the validity of my hobbed bolt design was brought into question 8-) on another thread that I would post something with lots of retractions.]]> Bruce Competitions Wed, 15 Aug 2012 12:13:06 -0400 https://reprap.org/forum/read.php?282,145377,148157#msg-148157 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,148157#msg-148157 Andrew Diehl Competitions Tue, 14 Aug 2012 12:13:02 -0400 https://reprap.org/forum/read.php?282,145377,148088#msg-148088 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,148088#msg-148088 www.thingiverse.com] (BallSocketSR.stl) has such a little bed contact that I had to resort modifying the model and using kapton to have it printed - no way to do this on heated glass only, even with a brim, an "abs glue" attempt etc.

I'd like to see what people come up with to have it adhere to their bed (besides kapton).]]> DeuxVis Competitions Tue, 14 Aug 2012 05:43:18 -0400 https://reprap.org/forum/read.php?282,145377,148016#msg-148016 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,148016#msg-148016
maybe next time in front of the post this line

I am entering the contest with this:



for now you will have to get next object as i can understand why he chosen you as the winner :-)]]> Weedz Competitions Mon, 13 Aug 2012 18:39:15 -0400 https://reprap.org/forum/read.php?282,145377,148006#msg-148006 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,148006#msg-148006 Bruce Competitions Mon, 13 Aug 2012 17:48:31 -0400 https://reprap.org/forum/read.php?282,145377,147532#msg-147532 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,147532#msg-147532
Bruce is the official winner with excellent bridging and quality, and simple no-hardware-required solution to the layer cooling.

Congratulations!]]> Andrew Diehl Competitions Sat, 11 Aug 2012 01:26:57 -0400 https://reprap.org/forum/read.php?282,145377,147515#msg-147515 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,147515#msg-147515
i love to check this thread seeing the nice things ppl make]]> Weedz Competitions Fri, 10 Aug 2012 19:55:38 -0400 https://reprap.org/forum/read.php?282,145377,146611#msg-146611 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,146611#msg-146611 Sliced with KISSlicer at .2mm layer height]]> Gulf Competitions Mon, 06 Aug 2012 18:55:19 -0400 https://reprap.org/forum/read.php?282,145377,146464#msg-146464 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,146464#msg-146464 My first attempt was pretty awful - just demonstrates the importance of a fan. I didn't have one for the Mendel90.
So, I then spent most of the weekend (when I wasn't watching the Olympics) designing prototype fan ducts. Finally, this evening I managed to make one that worked and fitted onto the printer.
And the acid test ...



I sliced the model using slic3r 0.8.3 and there is a problem with the gcode because the nozzle frequently doubled back on the bridges before it had reached the other side. To be a fair test of the fan, I decided to use the same file again.



There is a dramatic improvement in the vertical spirals, but still the same problem (nor surprising really) with some of the bridges. I cleaned these up and the resulting print is really quite acceptable now.



richgain
]]> richgain Competitions Sun, 05 Aug 2012 20:45:55 -0400 https://reprap.org/forum/read.php?282,145377,145985#msg-145985 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,145985#msg-145985 The nozzle used is a .4.

This is the Slic3r settings.

; generated by Slic3r 0.8.4 on 2012-08-01 at 13:09:38

; layer_height = 0.2
; perimeters = 2
; solid_layers = 3
; fill_density = 0.26
; nozzle_diameter = 0.38
; filament_diameter = 2.89
; extrusion_multiplier = 0.9
; perimeter_speed = 48
; infill_speed = 60
; travel_speed = 160
; scale = 1
; single wall width = 0.40mm

M190 S133 ; wait for bed temperature to be reached
M104 S224 ; set temperature
G28 ; home all axes
M109 S224 ; wait for temperature to be reached
G90 ; use absolute coordinates
G21 ; set units to millimeters
G92 E0 ; reset extrusion distance
M82 ; use absolute distances for extrusion

We are pretty new to Slis3r so we are still fiddling with it.

Although the nozzle temp says 224 it reads 232 with a probe, which is as cool as we could go without having extrusion problems.
The bed temp is also out of whack, in case you are wondering: Why so hot? We really should tune in our thermistor tables.
There was a problem with bridges sagging on the first attempt with the extrusion_multiplier set to 1 so I dropped it to .9..... and I used a fan.]]> Bruce Competitions Thu, 02 Aug 2012 17:46:33 -0400 https://reprap.org/forum/read.php?282,145377,145957#msg-145957 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,145957#msg-145957
I thought that it might be nyquist aliasing causing the problem, and I turned my layer size down from 0.3mm to 0.15mm. That made my rounded edges on the base look awesome, but didn't solve the bridging issue.

I'm using slic3r 0.8.5-dev.]]> tmbg Competitions Thu, 02 Aug 2012 15:01:41 -0400 https://reprap.org/forum/read.php?282,145377,145956#msg-145956 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,145956#msg-145956
Bruce, those look of exceptional quality. Want to let us know how you printed them (PLA/ABS? slicer/skeinforge? setting files?)]]> MotoBarsteward Competitions Thu, 02 Aug 2012 14:56:33 -0400 https://reprap.org/forum/read.php?282,145377,145805#msg-145805 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,145805#msg-145805
[attachment 8862 DoubleHelix.jpg]]]> Bruce Competitions Wed, 01 Aug 2012 15:18:45 -0400 https://reprap.org/forum/read.php?282,145377,145681#msg-145681 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,145681#msg-145681
Bleeding obvious really. Should have thought of this myself.

Time to wheel out the old desk fan, me thinks.

Sublime Wrote:
-------------------------------------------------------
> Do you have a fan blowing from one side only?]]> MotoBarsteward Competitions Wed, 01 Aug 2012 02:05:08 -0400 https://reprap.org/forum/read.php?282,145377,145627#msg-145627 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,145627#msg-145627 Sublime Competitions Tue, 31 Jul 2012 17:10:34 -0400 https://reprap.org/forum/read.php?282,145377,145624#msg-145624 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,145624#msg-145624
Printing with 0.1mm layers 50%infill every 2 layers 185 degrees in PLA.

Anyone got any good ideas?

Bad boy helix
Good boy helix]]> MotoBarsteward Competitions Tue, 31 Jul 2012 17:02:03 -0400 https://reprap.org/forum/read.php?282,145377,145458#msg-145458 Re: Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,145458#msg-145458 NewPerfection Competitions Mon, 30 Jul 2012 23:15:10 -0400 https://reprap.org/forum/read.php?282,145377,145377#msg-145377 Double Helix / Week of July 31 to Aug 6 - 2012 https://reprap.org/forum/read.php?282,145377,145377#msg-145377
I made this a while ago, and it is both cool to have lying around and a challenge for bridging! Good luck!

[www.thingiverse.com]


]]> Andrew Diehl Competitions Mon, 30 Jul 2012 11:25:17 -0400