Print speeds??

Here is a place we can talk about using ZTW CNC platform for 3D printing. Your experience with software setup, configuration for different type of filament and etc.

Print speeds??

Postby abobotek » Sat Jan 05, 2013 8:04 pm

I'm printing at 50mm/s with printing acceleration limited to 50mm/s^2. The print speed limit I'm finding is an "acceleration vs print quality" tradeoff. If I go faster than this, there are significant overshoot artifacts visible in the print as the Zen carriages stabilize after rapid acceleration. [Note: this is not caused by play; it's damped oscillation.] Acceleration is limited by the rigidity of the unit rather than the power of the motors.

What speeds/accelerations are others using? Could you post your values and/or configs?

Here's my Marlin config:

#define DEFAULT_AXIS_STEPS_PER_UNIT {400,400,400,88} // default steps per unit for Zen
#define DEFAULT_MAX_FEEDRATE {50, 50, 50, 15} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {75,75,75,1000} // X, Y, Z, E mm/sec^2 maximum start speed for accelerated moves.
#define DEFAULT_ACCELERATION 50 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 1000 // X, Y, Z and E max acceleration in mm/s^2 for r retracts
#define DEFAULT_XYJERK 15.0 // (mm/sec^3)
#define DEFAULT_ZJERK 5 // (mm/sec^3)
#define DEFAULT_EJERK 5.0 // (mm/sec^3)
User avatar
abobotek
Normal User
 
Posts: 34
Joined: Mon Sep 03, 2012 8:09 pm
Zen Model: Zen 1212

Re: Print speeds??

Postby roller » Sun Jan 06, 2013 12:54 am

Try lowering you XYjerk and see if you can get away with higher acceleration. The will potentially speed up your prints but maintain you quality.

I am finding similar issues to you but my Zen is not stock and is oversized so I have greater issues with flex. Check back for my mods once I get them sorted as they should apply to other stock Zens too.
User avatar
roller
Forum Moderator
 
Posts: 474
Joined: Wed Jan 26, 2011 8:54 pm
Location: Brisbane, Australia
Zen Model: Zen 0712 (Ext. Mod)

Re: Print speeds??

Postby wolfmanjm » Fri Jan 10, 2014 4:04 am

Hi, I built my zen quite some time ago, it has been a good solid printer, although now I have two other printers, so I am returning my zen to a CNC configuration ;)

Anyway I run mine at 25mm/sec max, with 1000mm/sec^2 acceleration and xy jerk set to 5. Works nicely at that.

If I try to go faster than 35mm/sec it starts to loose steps.

I found a good steady print speed is 20mm/sec perimeters and 25mm/sec travel moves and infill. for good quality solid prints.

If I want speed I use my Delta printer :) If I want accuracy I use the Zen.
User avatar
wolfmanjm
Normal User
 
Posts: 54
Joined: Mon Aug 13, 2012 7:07 pm
Zen Model: Zen 0707
Other CNC Info: 7x7 3d

Re: Print speeds??

Postby roller » Fri Jan 10, 2014 7:49 am

Wow, almost a year after the previous post ... almost like an anniversary. Curiously, I too am converting the Zen back to CNC after it's been sitting idle for 9 months. It's getting a serious rigidity upgrade to mill aluminium - might keep the F20 screws and 269Ozin motors to see how it goes. Just a bit of a fun experiment.
User avatar
roller
Forum Moderator
 
Posts: 474
Joined: Wed Jan 26, 2011 8:54 pm
Location: Brisbane, Australia
Zen Model: Zen 0712 (Ext. Mod)

Re: Print speeds??

Postby wolfmanjm » Fri Jan 10, 2014 10:13 pm

I'll be interestd to see how that goes, I am also lookign to mill some pretty thin aluminum plate, nit sure how well that will go. But the majority of uses will be PCB routing.
User avatar
wolfmanjm
Normal User
 
Posts: 54
Joined: Mon Aug 13, 2012 7:07 pm
Zen Model: Zen 0707
Other CNC Info: 7x7 3d

Re: Print speeds??

Postby roller » Sat Jan 11, 2014 12:01 am

I actually already have a 1200 x 600 (4'x2') CNC now that I designed as a Zen (7x12 or 12x12) friendly project. I ended up not doing it on the Zen as I had access to industrial machining for a week but I did some proof of concept on the Zen. I really should post some details.
User avatar
roller
Forum Moderator
 
Posts: 474
Joined: Wed Jan 26, 2011 8:54 pm
Location: Brisbane, Australia
Zen Model: Zen 0712 (Ext. Mod)


Return to 3D Printing with ZTW Filament and CNC

cron

x