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Now this code works very well. Thank you very much!

Like This (defun c:Ch-DimTxtOff ( / ss entData n) (setq ss (ssget '((0 . "DIMENSION")))) (while (and (setq dim (ssname ss (setq n (if n (1+ n) 0)))) (= (cdr (assoc 0 (entget dim))) "DIMENSION")) (vlax-put-property (vlax-ename->vla-object dim) "TextGap" 0.425) ) (princ) )

You just need to replace the entire block under 'progn' with (vlax-put-property (vlax-ename->vla-object dim) "TextGap" 0.425)

The problem is that there's no DXF code 147 to control the text gap. That's controlled directly from the coordinate associated with code 11. From VLA, you can control the gap using the "TextGap" property.

Okay I guess it was also necessary to update from 'if' to 'while' I edited that a few minutes ago, too.

(defun c:Ch-DimTxtOff ( / ss entData n) (setq ss (ssget '((0 . "DIMENSION")))) (while (and (setq dim (ssname ss (setq n (if n (1+ n) 0)))) (= (cdr (assoc 0 (entget dim))) "DIMENSION")) (progn (setq entData (entget dim)) (setq entData (subst (cons 147 0.425) (assoc 147 entData) entData)) (entmod entData) ) ) (princ) ) I just added the code to define 'dim' I haven't checked anything else.

(ENTGET DIM).. DIM is not defined

TRY https://help.autodesk.com/view/OARX/2022/ENU/?guid=GUID-E39FFEDE-FF81-4071-81E9-02D9C376D918

In the below post I demonstrate a concept program to facilitate mirroring a block without mirroring the text it contains: https://www.theswamp.org/index.php?topic=46271.msg513250#msg513250

You can thing of those as name spaces of ObjectARX. Rx = AcRx, the most base classes for all AutoCAD objects Ge = AcGe, Geometry classes, Points, Vectors, Curves Gi = AcGi , has the class AcGiDrawable, mostly responsible for drawing entities on your screen Gs = AcGs, Graphics system, access to drawing devices and of course getBlockImage Ap = Application level stuff such as the document manager Db = AcDb, the database (.DWG) Ed = AcEd, Editor, selection sets, entsel, getPoint Ax = all of the ActiveX stuff Br = AcBr, access to 3d geometry Brx = stuff specific to BricsCAD. there’s also BrxBim and BrxCv They are all in PyRx, and are loaded in the ARX, so its ok to just include them all Also the .NET documentation is relevant, see Unmanaged to Managed Class Mappings https://help.autodesk.com/view/OARX/2024/ENU/?guid=GUID-390A47DB-77AF-433A-994C-2AFBBE9996AE