diff --git a/src/components/DistBuilder.re b/src/components/DistBuilder.re
index abc02f74..bfcbcb51 100644
--- a/src/components/DistBuilder.re
+++ b/src/components/DistBuilder.re
@@ -151,7 +151,7 @@ let make = () => {
       ~schema,
       ~onSubmit=({state}) => {None},
       ~initialState={
-        guesstimatorString: "mm(40 to 80, floor(50 to 80), [.5,.5])",
+        guesstimatorString: "40 to 8000",
         domainType: "Complete",
         xPoint: "50.0",
         xPoint2: "60.0",
@@ -162,7 +162,7 @@ let make = () => {
         unit: "days",
         sampleCount: "10000",
         outputXYPoints: "500",
-        truncateTo: "0",
+        truncateTo: "100",
         kernelWidth: "5",
       },
       (),
diff --git a/src/distributions/DistPlusIngredients.re b/src/distributions/DistPlusIngredients.re
index c2a8b882..86fd10f3 100644
--- a/src/distributions/DistPlusIngredients.re
+++ b/src/distributions/DistPlusIngredients.re
@@ -23,7 +23,6 @@ let toDistPlus =
       ~sampleCount,
       ~outputXYPoints,
       ~kernelWidth,
-      ~truncateTo,
       (),
     );
   let distPlus =
@@ -40,5 +39,9 @@ let toDistPlus =
     |> E.O.fmap(
          Distributions.DistPlus.T.scaleToIntegralSum(~intendedSum=1.0),
        );
-  distPlus;
+  switch (truncateTo, distPlus) {
+  | (Some(t), Some(d)) => Some(d |> Distributions.DistPlus.T.truncate(t))
+  | (None, Some(d)) => Some(d)
+  | _ => None
+  };
 };
\ No newline at end of file
diff --git a/src/distributions/Distributions.re b/src/distributions/Distributions.re
index e044bb8f..be95b200 100644
--- a/src/distributions/Distributions.re
+++ b/src/distributions/Distributions.re
@@ -16,10 +16,10 @@ let max = (f1: option(float), f2: option(float)) =>
 
 module type dist = {
   type t;
+  type integral;
   let minX: t => option(float);
   let maxX: t => option(float);
   let pointwiseFmap: (float => float, t) => t;
-  let truncate: (int, t) => t;
   let xToY: (float, t) => DistTypes.mixedPoint;
   let toShape: t => DistTypes.shape;
   let toContinuous: t => option(DistTypes.continuousShape);
@@ -27,8 +27,8 @@ module type dist = {
   let toScaledContinuous: t => option(DistTypes.continuousShape);
   let toScaledDiscrete: t => option(DistTypes.discreteShape);
   let toDiscreteProbabilityMass: t => float;
+  let truncate: (~cache: option(integral)=?, int, t) => t;
 
-  type integral;
   let integral: (~cache: option(integral), t) => integral;
   let integralEndY: (~cache: option(integral), t) => float;
   let integralXtoY: (~cache: option(integral), float, t) => float;
@@ -112,7 +112,6 @@ module Continuous = {
       let toDiscreteProbabilityMass = _ => 0.0;
       let pointwiseFmap = (fn, t: t) =>
         t |> xyShape |> XYShape.T.pointwiseMap(fn) |> fromShape;
-      let truncate = i => shapeMap(XYShape.T.convertToNewLength(i));
       let toShape = (t: t): DistTypes.shape => Continuous(t);
       let xToY = (f, {interpolation, xyShape}: t) =>
         switch (interpolation) {
@@ -144,6 +143,14 @@ module Continuous = {
           |> E.O.toExt("This should not have happened")
           |> fromShape
         };
+      let truncate = (~cache=None, i, t) =>
+        t
+        |> shapeMap(
+             XYShape.T.convertToNewLengthByProbabilityMass(
+               i,
+               integral(~cache, t).xyShape,
+             ),
+           );
       let integralEndY = (~cache, t) => t |> integral(~cache) |> lastY;
       let integralXtoY = (~cache, f, t) =>
         t |> integral(~cache) |> shapeFn(XYShape.T.findY(f));
@@ -185,7 +192,7 @@ module Discrete = {
       let toDiscrete = t => Some(t);
       let toScaledContinuous = _ => None;
       let toScaledDiscrete = t => Some(t);
-      let truncate = (i, t: t): DistTypes.discreteShape =>
+      let truncate = (~cache=None, i, t: t): DistTypes.discreteShape =>
         t
         |> XYShape.T.zip
         |> XYShape.T.Zipped.sortByY
@@ -267,6 +274,7 @@ module Mixed = {
 
       let truncate =
           (
+            ~cache=None,
             count,
             {discrete, continuous, discreteProbabilityMassFraction} as t: t,
           )
@@ -414,7 +422,7 @@ module Shape = {
           ),
         );
 
-      let truncate = (i, t: t) =>
+      let truncate = (~cache=None, i, t: t) =>
         fmap(
           t,
           (
@@ -603,7 +611,7 @@ module DistPlus = {
       let integral = (~cache, t: t) =>
         updateShape(Continuous(t.integralCache), t);
 
-      let truncate = (i, t) =>
+      let truncate = (~cache=None, i, t) =>
         updateShape(t |> toShape |> Shape.T.truncate(i), t);
       // todo: adjust for limit, maybe?
       let pointwiseFmap = (fn, {shape, _} as t: t): t =>
diff --git a/src/distributions/XYShape.re b/src/distributions/XYShape.re
index 6198617d..7cc80525 100644
--- a/src/distributions/XYShape.re
+++ b/src/distributions/XYShape.re
@@ -112,6 +112,13 @@ module T = {
     );
   };
 
+  let convertToNewLengthByProbabilityMass =
+      (newLength: int, integral: t, t: t): DistTypes.xyShape => {
+    Functions.range(0.0, 1.0, newLength)
+    |> E.A.fmap(findX(_, integral))
+    |> convertWithAlternativeXs(_, t);
+  };
+
   module XtoY = {
     let stepwiseIncremental = (f, t: t) =>
       firstPairAtOrBeforeValue(f, t) |> E.O.fmap(((_, y)) => y);
diff --git a/src/utility/Guesstimator.re b/src/utility/Guesstimator.re
index 02e45353..168810eb 100644
--- a/src/utility/Guesstimator.re
+++ b/src/utility/Guesstimator.re
@@ -184,11 +184,9 @@ let toMixed =
       ~sampleCount=3000,
       ~outputXYPoints=3000,
       ~kernelWidth=10,
-      ~truncateTo=Some(500),
       ~cuttoff=0.995,
       (),
     ) => {
-  // let truncateTo = None;
   let start = Js.Date.now();
   let timeMessage = message => Js.log2(message, Js.Date.now() -. start);
   timeMessage("Starting");
@@ -215,12 +213,5 @@ let toMixed =
   let continuous = pdf |> Distributions.Continuous.fromShape;
   let shape = MixedShapeBuilder.buildSimple(~continuous, ~discrete);
   timeMessage("Finished shape");
-  let shape =
-    switch (truncateTo, shape) {
-    | (Some(trunctate), Some(shape)) =>
-      Some(shape |> Distributions.Shape.T.truncate(trunctate))
-    | (None, Some(shape)) => Some(shape)
-    | _ => None
-    };
   shape;
 };
\ No newline at end of file