Update on Pulse Layer Shifting

After watching the Pulse printer from MatterHackers go through a number of prints I thought the Z frame wobbled quite a bit compared to other printers. I saw this happening even at fairly slow print speeds.

Just as an experiment I decided to try and secure the Z frame during printing with a custom bracket (3D Printed of course).

Pulse Z bracket

I essentially stabilized the Z frame by attaching the bracket to a nearby stable shelf. The plastic on the right of the bracket between the shelf is just a shim to get it as stable as possible. The bracket is then screwed into the shelf.

The resulting prints are significantly better. The picture below has two prints from the Pulse that use the exact same gcode and filament. One is with the bracket (left) and the other is without the bracket (right).

Comparison print

You can see the worst of the layer shifts are significantly better, and in some cases they completely disappear.

I think other cartesian printers mitigate this issue by securing the power supply to the Z and Y frame, but because the Pulse has an unattached power supply (which is great for enclosure printing) the Z frame reacts more to movement. The Pulse has the filament spool holder in the place other printers might have a power supply, but it does not seem to provide enough stability, especially with tall and thin prints.

If you have a similar setup you are welcome to download the STL file and customize it for your needs:

https://www.thingiverse.com/thing:2996677

MatterHackers Pulse Review

The MatterHackers Pulse is a Prusa i3 style printer with the base model including a BLTouch and heated bed with BuildTak starting at $799. The Pulse printer also comes pre-assembled and tested, and is customizable with typically one week lead time before shipping. Speaking of shipping, it ships in the USA for free which is a great deal considering the size of the box. The printer has a generous 45 day return window, and a 1 year repair-or-replace warranty.

Some nice upgrades are available including an Olsson Ruby Nozzle, garolite bed, LCD screen, and a Bondtech Extruder with E3D all metal V6 Hotend (this is a must have in my opinion). The printer has a 250x220x215 build area.

The printer I purchased came with the Garolite Bed, LCD screen, Filament Runout Sensor, Bondtech Extruder with E3D V6 Hotend, and Ruby Nozzle.

One thing to note is, while this is a Prusa i3 style printer, it uses a Bowden configuration instead of direct drive. A lot of printers use Bowden (Ultimaker, CR-10, etc) so this is not out of the ordinary. The biggest things to look out for is setting retraction correctly and handling materials traditionally harder to print with a Bowden printer like flexibles. The Pulse is configurable with a Bondtech extruder and this upgrade would help when printing flexible materials.

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