Mendel

Hello, i am new to these forums, i have got an issue with my mendel printer,
Everything i print is double the size on the z axis, i am certain it is a firmware
issue, but i cannot find it, i am running marlin firmware with cura.

Any help would be appreciated

Edited 1 time(s). Last edit at 12/29/2014 06:32PM by rcarrier31.

Quote
rcarrier31
Hello, i am new to these forums, i have got an issue with my mendel printer,
Everything i print is double the size on the z axis, i am certain it is a firmware
issue, but i cannot find it, i am running marlin firmware with cura.

Any help would be appreciated

What controller? RAMPS? are there 3 jumpers under the driver?
For your firmware use the Prusa calculator for your Z steps
[prusaprinters.org]

Steve

---

My updated Instructable on our Prusa i3 Build
[www.instructables.com]

Makerbase v 1.0 controller, no ramps, z is direct drive, table moves.

Either your jumper on your stepper driver is wrong or the E_STEPS_PER_MM_Z is wrong on your firmware.

---

Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

I dont see any jumpers on the board, and cannot find that command in the firmware?
which library should it be in?

Hello

It is the firmware. You can set as follows:
Most RepRap printers use a pair of threaded rods for the Z axis. So to calculate how far the Z axis moves for each revolution of the motor, first you need to know how much rotation is being transmitted to the Z rods, and then use the "thread pitch" of the rod (distance-per-revolution) to determine the vertical motion.

The basic formula to calculate motion on a rotating rod is:
steps_per_mm = (motor_steps_per_rev * driver_microstep) / thread_pitch


Some common examples:
// NEMA 17 with standard pitch M5 threaded rod:
(200 * 16) / 0.8 = 4000

// NEMA 17 with standard pitch M8 threaded rod:
(200 * 16) / 1.25 = 2560

// NEMA 17 with SAE 5/16" threaded rod. It has 18 threads per inch (25.4mm / 18):
(200 * 16) / (25.4 / 18) = 2267.7165355

see more at [reprap.org]

---

Everything of 3D printer. www.3dminions.com
[www.facebook.com]