Another free project for Vectric users

I found another free file for Vectric users. There are STL, crv3d and 3Dclip versions

1 Like

Thanks, I have been looking for art like this.

Go into Google images and search for 3d grayscale images. There are zillion of them. Some free, some if you don’t mind “borrowing.”

For example:

Did someone said Gray Scale images… I thought we’re talking about 3D carvable .STL files.
Those Gray Scale images good for Laser Engraving to flat surface.

The .3DClip file is an aspire clipart file.

1 Like

Majority of those grayscale images in GuyKass’s link are Depth Maps like the one Allen posted. There no good for 2D laser engraving, but work very good for 3D laser engraving, or cutting a spindle relief with an image to gcode program like our PicEngrave Pro 5.

There are free reliefs in different formats that can be downloaded from here too.

Hobby CNC Art


Carving images like this takes a while. And with that much detail it’s a lot of work smoothing it all out. I’ve done a lot of carving with a lot of detail and it’s a lot of work. It’s worth it if you need that one really nice project though.

Here’s a Chinese link to some totally awesome depth maps images.

But if you turn them into g-code using aspire you will also have to sand it down after carving which is a lot of work. And nobody will pay the price that you would want for all the time spent.

Chinese web site

Hi Phil

I usually carve stuff with a step over of 5 passes per 1/16 inch. Pencil shaped bit to get good detail.

Yes, tighter step over is the way to reduce machining marks.

1 Like

Wow. That’s tight. I’ll have to try that.

So you go about 8 passes per 1/16" inch. That would be much better.

I’m with @PhilJohnson . A smaller step over at 120ipm very little if any sanding. A quick once over with a dremal and sanding wheel is all I’ve ever had to do.

What does 120 ipm mean during a 3D finish pass? Nothing is moving anywhere near 120 ipm.

If your acceleration setting is set to the standard 50 mm/sec^2 then it would take about a full second to reach 120 ipm. But the Z axis is moving at least once per mm of travel and the X/Y positioning must stop and wait on the Z so optimistically you may be moving at 12 to 15 ipm.

If you match your plunge rate your z will also move that fast. I have yet to do a 3D module that has 90deg corners. The Z always moves in conjunction with the X and Y. So I don’t understand why your X-Y travel is stopping to allow your Z to move up and down. Maybe I’m just confused.

1 Like

Why do 90 deg corners make any difference? You may be talking about cornering algorithms that will slow the machine to allow it to turn without exceeding max accelerations (a very tricky problem)

While cornering will slow the speed, that is not what I am talking about.

If you are doing a spiral or offset pattern, then the spindle direction is constantly changing which can also lower feedrates. But even if you are doing a raster pattern where X or Y is not changing except at edges, the Z axis is in near constant motion. The Z axis is also the slowest axis on the machine, so the X/Y cannot proceed until the Z axis reaches the next step.

I also just noticed that GRBL 1.1 has been released that includes support for lasers! Plus lots of other new features.

Phil there are two acceleration issues.

  1. The first is the acceleration control necessary for the spindle to turn, the closer the turn is to 90 deg the more the spindle needs to slow. That is not the acceleration limiter I am talking about here.

  2. The second limiter is due to the time it takes for Z axis to reach the next height. Even if your Z axis is moving a 70 ipm, the X/Y is not, since 70ipm would be the max speed for your X/Y it cannot instantly go from 0 to 70 ipm, so each time the X/Y slows or stops for the Z axis movement, it must then begin to accelerate to the next location, but the next location is only a mm away so it will immediately be waiting on the Z axis again. So setting your feedrate to 120 ipm makes no real difference, during the 3D detail pass your spindle will never be moving at 120 ipm.

This is simple enough to prove. During the roughing pass the Z axis is constant and therefore will not be affecting the X/Y speeds, so you can move at 120 ipm during the roughing pass.

So, set the same feed rate for the roughing and detail passes and time the roughing pass and detail pass I bet the roughing pass takes a lot less time.

It is not possible to go from zero to a non zero speed instantly in the real world.

(Unless you have added the very expensive inertial damper option)

My point wasn’t for a 90 deg corner in the X Y movement. But a 90 deg corner in the Z movement. The only time the X Y would have to come to a complete stop to wait for the Z is if it was drilling a hole / or making a 90 deg movement relative to its last position. But as I have stated in many other posts of the same discussion. This theory remains the case whatever your max ipm is set at. So according to your calculations of never exceeding 12 ipm set at 120. If your set at 60 you’ll never exceed 6ipm. Still twice as fast. Please don’t take me the wrong way. I have compleat respect for you and your knowledge. I guess I’m not understanding your point. Any way you cut it. 120ipm is twice as fast as 60ipm. Or am I wrong there?

The flat sections do not need a 3D detail pass.

Then the section is not flat is it.

This makes no sense. The roughing pass is meant to be faster. I’m not doing a roughing pass with a 1/8" ballnose set at .008 stepover. A roughing pass is meant to hog out as much material as quickly as possible. This allows you to run a finishing pass more quickly. And every roughing pass I have ever run has Z axis movement.

1 Like